JP2007045439A - Resealable packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resealable packaging bag which can be easily unsealed and is re-sealable by everybody. <P>SOLUTION: The resealable packaging bag is characterized in that the packaging bag has an opening comprising a tab seal with two films and a pressure-sensitive adhesive layer between the films is stuck between two films forming the packaging bag in the opening of the packaging bag, and the shape of the tab seal becomes gradually narrower toward the center from both sides of the tab seal, and in addition, an unsealed part is formed on the films of the bag on the outside of the opening of the tab seal. The tab seal is composed of a film comprising an olefin resin, a pressure-sensitive adhesive comprising a mixture of a rubbery copolymer and a tackifier, and a film comprising an olefin resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resealable packaging bag that is simple and has excellent hygiene and also has excellent adhesive properties.

In recent years, there has been proposed a packaging bag that enables re-sealing of the packaging bag so as not to miss the drying and drug effect by using a re-adhesive film or a re-adhesive tape instead of a plastic zipper or the like.
JP 2004-122374 A JP 2004-83094 A

  Use of the re-adhesive film and re-adhesive tape as shown above for the opening makes it necessary to increase the force applied at the time of opening because it uses cohesive peeling between the adhesives. It becomes difficult to provide. In addition, when a re-adhesive film or re-adhesive tape is used for a three-sided sealed bag product as an alternative to a zipper, a finger or the like is inserted and opened from the opening of the packaging bag. There is a disadvantage that the re-adhesive strength required at the time of sealing cannot be obtained.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a resealable packaging bag that can be easily opened and resealed by everyone.

  The packaging bags provided to achieve the above object in the present invention are packaging bags having tab seals bonded from the side part of the packaging bag opening to the opposite side part as shown in FIGS. 1 and 2, respectively. It is the re-adhesive packaging bag which can be opened from the corner | angular part.

In the present invention, claim 1
A packaging bag having an opening in which a tab seal having a pressure-sensitive adhesive layer between the two films and the two films forming the packaging bag is bonded to the opening of the packaging bag; The shape of the tab seal is gradually narrowed from both sides of the tab seal toward the center, and the bag film is provided with an unsealed portion outside the opening portion of the tab seal and the bag seal. It is a sealed packaging bag.

The invention of claim 2 is the resealable packaging bag according to claim 1,
The tab seal is constituted by a film made of an olefin resin, an adhesive made of a mixture of a rubbery copolymer and a tackifier, and a film made of an olefin resin.

The invention of claim 3 is the resealable packaging bag according to claim 1 or 2,
The rubbery copolymer is either a rubbery block copolymer having a styrene block as a constituent component or a rubbery copolymer obtained by using ethylene as an essential component, and the tackifier is a rosin resin. , Tempen resin, petroleum resin, or a combination thereof.

Moreover, invention of Claim 4 is the resealable packaging bag in any one of Claims 1-3,
The tab seal is made of a film made of an olefin resin, an adhesive layer, a base material layer, and a film made of an olefin resin.

Furthermore, the invention of claim 5 is the resealable packaging bag according to claims 1 to 4,
The pressure-sensitive adhesive layer is made of any one of ethylene-α olefin copolymer, propylene-α olefin copolymer, ethylene-vinyl acetate copolymer, αβ unsaturated carboxylic acid modified ethylene polymer, or a blend resin thereof. The base material layer is made of a styrene-based elastomer.

The invention of claim 6
A resealable packaging bag, wherein the happing agent is packaged in any one of claims 1 to 5.

  The re-sealable packaging bag of the present invention opens the unsealed part, and opens the adhesive layer from either side part (corner part) in FIGS. It is formed and can be opened easily thereafter. In addition, it is not forcibly opened, but is sequentially opened from the side portion, so that the peeled surface becomes smooth, and the re-adhesion strength required at the time of re-sealing is easily developed.

  As described above, opening can be performed easily, and the adhesive strength required at the time of resealing can be maintained. Therefore, it can be used in various fields including medical-related articles and foods. In particular, it has an excellent effect on light packaging such as a patch.

  The best mode of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view showing a resealable packaging bag in one embodiment of the present invention. Moreover, FIG. 2 is explanatory drawing which shows the resealable packaging bag in the other Example of this invention.

  (10) shown in the figure is a resealable packaging bag, (11) is an unsealed portion at the opening of this packaging bag, (12) is a tab seal portion, and (14) is the heat of the packaging bag. In the seal portion, (15) indicates a heat-sealed bottom portion, and (H1) and (H2) indicate corner portions at the opening of the packaging bag.

  The present invention provides a re-sealable packaging having a reseal function by utilizing delamination or cohesive delamination between pressure-sensitive adhesive layers by providing a tab seal which is a laminate having a pressure-sensitive adhesive layer at the opening of a packaging bag. It is a bag.

  As shown in FIG. 1, two films and a tab seal (12) having an adhesive layer seal portion between the two films form a packaging bag at the opening (11) of the packaging bag (10). It is a packaging bag adhered between the film. The shape of the tab seal has a substantially left-right symmetric inclined shape that gradually becomes narrower as long as the adhesive layer seal portion can be secured from both sides of the tab seal toward the center of the packaging bag. Furthermore, it is the resealable packaging bag which provided the unsealed part (11) in the film of the bag outside the adhesive layer seal part of the tab seal. The parts other than the tab seal (12) of the packaging bag are so-called three-side sealed packaging bags provided with side seal parts (14, 14) and a bottom part (15) on both sides.

In the packaging bag shown in FIG. 2 as well as the packaging bag in FIG. 1, the seal shape of the tab seal (12) attached to the opening of the packaging bag is gradually narrowed so as to be gradually narrowed within a range in which the opening sealing portion can be secured. When the shape reaches the necessary opening re-adhesive layer seal part (12a) line, it has a shape parallel to the bottom part (15) of the package. Also in the case of this packaging bag, an unsealed portion (11) is provided on the film of the bag outside the adhesive layer seal portion (12a).

  Further, the tab seal of the opening having the pressure-sensitive adhesive layer seal portion (12, 12a) is attached without leaving from the side of the packaging bag to the opposite side.

  Next, the re-adhesive seal is a laminate (tab seal) in which an adhesive made of a mixture of a rubbery copolymer and a tackifier and a film made of an olefin resin are sequentially laminated on a film made of an olefin resin. is there.

  The rubbery copolymer is either a comby block copolymer containing a styrene block or a rubbery copolymer obtained by using ethylene as an essential component, and the tackifier is rosin resin, tempen resin, petroleum Any one or combination of resins.

  Another re-adhesive seal is a laminate (tab seal), an olefin-based resin film, and the pressure-sensitive adhesive layer is an ethylene α-olefin copolymer, propylene-α olefin copolymer, ethylene vinyl acetate copolymer, ethylene αβ It consists of a low crystalline or amorphous polymer of any unsaturated copolymer, a petroleum resin, or a blended resin thereof, and further uses a styrenic elastomer as a base material layer.

  These pressure-sensitive adhesives were laminated between films made of an olefin resin and welded or adhered to an opening of an arbitrary packaging bag to obtain a resealable packaging bag. Since the obtained packaging bag has a high resealability function to prevent drying and volatilization, it is optimal for storing a haptic agent or the like without limitation.

  The resealing packaging bag of the present invention can be manufactured, for example, by the following method.

  That is, first, the adhesive B and the polyolefin resin C are coextruded on a peelable substrate film (for example, a PET film) A. The obtained laminate is punched into a tab seal shape to produce two tab seal laminates. Next, these two tab seal-like laminates are respectively bonded to the two films constituting the packaging bag. This adhesion is possible by thermocompression bonding using the polyolefin resin as a sealant layer. Next, the peelable substrate film A is peeled and removed from the tab seal-like laminate bonded to the film to expose the pressure-sensitive adhesive. Then, the above two films are overlapped so that these exposed adhesives face each other, and the surroundings including these adhesives are sealed to produce the re-sealing packaging bag of the present invention. It is possible. In addition, what is necessary is just to coextrude including this base material layer, when a tab seal has a base material layer.

  Next, as shown in FIGS. 1 and 2, the resealable packaging bag of the present invention can be easily opened from either the left or right corner of the bag, thereby easily triggering the peeling of the adhesive layer. It is formed and can be opened easily thereafter. Moreover, since it opens sequentially from either side instead of opening forcibly, a peeling surface becomes smooth and the re-adhesion strength required at the time of resealing is easy to be obtained (refer FIG. 3).

A PET film was used as the peelable substrate film A, and on this peelable substrate film A, an adhesive B1 and a polyethylene resin C (manufactured by Ube Industries Co., Ltd.) having the following composition under conditions of an extrusion temperature of 200 to 240 ° C. Was coextruded to produce a tab seal laminate. The peelable substrate film A has a thickness of 12 μm, the adhesive B has a thickness of 20 μm, and the polyolefin resin has a thickness of 20 μm.

Adhesive B1 composition 50% by weight of styrene-butadiene block copolymer
Tenpen resin 20% by weight
(Yasuhara Chemical Co., Ltd .; YS Resin PX1150)
Polyethylene 30% by weight
The peelable substrate film A was peeled and removed from the obtained laminate to expose the pressure-sensitive adhesive layer B, and the pressure-sensitive adhesive layers B were bonded together, and the adhesive strength was measured. Moreover, the re-adhesion was repeated and the adhesive strength at the time of the re-adhesion was measured.

  Moreover, the adhesive strength between the said peelable base film A and the adhesive layer B was measured for the comparison. Moreover, the re-adhesion was repeated and the adhesive strength at the time of the re-adhesion was measured.

  A tab seal laminate was produced in the same manner as in Example 1 except that Tough Selenium H3002 manufactured by Sumitomo Chemical Co., Ltd. was used as the adhesive B2, and the adhesive strength was measured.

                                                                      A tab-seal laminate was produced in the same manner as in Examples 1 and 2 except that a styrene elastomer was interposed as a base material layer between the adhesive B and the polyethylene resin C, and the adhesive strength was measured.

<Test>
Based on the above-mentioned Examples 1 to 3, tests of layer separation and cohesive peeling of each prototype were performed, and the results are shown in Table 1.

The measurement of this test is to measure the correlation peeling
・ Test equipment: Tensile tester (Test equipment defined in JIS K7127)
Test piece: 25 mm wide and 100 mm long (including the test piece gripping part)
・ Test speed: 300mm / min
・ Peeling angle: 90 ° (T type)
・ Measuring method: Remove the film between each peeling to make a grip part of the test piece.
To make. Attach the gripping part of the test piece to the gripping tool of the testing machine. this
When making sure that the peel angle of the specimen is 90 ° (T type),
Secure it so that it does not slip in the grip during the test. Test speed is 300mm
/ Min, and an average value was obtained from the obtained graph. N = 3 specimens are available
And the average value was made into the measured value.

  As a result of the above test, it was confirmed that the tab seal according to the present invention has a sufficient re-sealing strength while keeping the adhesive strength around 1.0 N / 25 mm even when re-adhering repeatedly. The strength is such that, for example, the contents are not spilled even if the haptic agent is accommodated and the opening portion is turned upside down, and can be easily opened by hand.

Articles to be packaged in the bag body of the present invention are not particularly limited, and in particular, patches such as a haptic agent, a plaster, a cooling sheet, a patch, a reservoir-type patch, a wound dressing, a bandage, water, and a volatile component Can be suitably used for foods, chemical fertilizers, chemicals such as agricultural chemicals, cosmetics, etc., preferably haps, plasters, cooling sheets, batches, reservoir patches, wound dressings, adhesive plasters It is desired to be used for patches such as.

It is explanatory drawing which shows the resealable packaging bag in one Example of this invention. It is explanatory drawing which shows the resealable packaging bag in the other Example of this invention. It is explanatory drawing of the opening method of the resealable packaging bag in this invention.

Explanation of symbols

10 ... Resealable packaging bag 11 ... Unsealed part of opening 12, 12a ... Re-adhesive seal part (tab seal part)
14 …… Heat seal part 15 …… Bottom part (heat seal part)
H1, H2 ... Corner of opening

Claims (6)

  A packaging bag having an opening in which a tab seal having a pressure-sensitive adhesive layer between two films is bonded to an opening of the packaging bag between the two films forming the packaging bag. The shape of the tab seal is gradually narrowed from both sides of the tab seal toward the center, and further, an unsealed portion is provided on the outer side of the opening of the tab seal and in the bag film. Resealable packaging bag.   The tab seal is composed of a film made of an olefin resin, a pressure-sensitive adhesive made of a mixture of a rubbery copolymer and a tackifier, and a film made of an olefin resin. Resealable packaging bag as described.   The rubbery copolymer is either a rubbery block copolymer having a styrene block as a constituent component or a rubbery copolymer obtained by using ethylene as an essential component, and the tackifier is a rosin resin. 3. The resealable packaging bag according to claim 1, wherein the resealable packaging bag is any one of, a tempen resin, a petroleum resin, or a combination thereof.   The resealable packaging according to any one of claims 1 to 3, wherein the tab seal is made of a film made of an olefin resin, an adhesive layer, a base material layer, and a film made of an olefin resin. bag.   The pressure-sensitive adhesive layer is composed of any one of ethylene-α olefin copolymer, propylene-α olefin copolymer, ethylene vinyl acetate copolymer, αβ unsaturated carboxylic acid-modified ethylene polymer, or a blend resin thereof. The resealable packaging bag according to any one of claims 1 to 4, wherein the base material layer is made of a styrene-based elastomer.   The resealable packaging bag according to any one of claims 1 to 5, wherein a haptic agent is packaged.

Images